Thanks to @hacdias, I found this nice project: Awfice - the world smallest office suite.
- a word processor, a spreadsheet, a drawing app and a presentation maker
- each is literally just one line of code
- packaged as data URLs, so you can use them right away, without downloading or installing
The tools are very minimal, but it’s nice to see what’s possible with under 1 kilobyte of code. There’s also an article with some background information.